How do you keep track of memorabilia?

Good question. I'll be watching for answers.
I have TONS of stuff like this. At one point, I bought a Slam Book and figured I would just put it all in there, kind of willy-nilly with a bit of journaling. I never got around to it though, and some things won't fit anyway. At present most of it is stuffed in boxes and stored in my cedar 'hope chest' in the basement. I still save all kinds of 'stuff' so some things are in my bedroom in a drawer, the newer things.
I think the biggest roadblock to me getting it put into a book of some sort is the fact that I feel it should be done in chronological order. I need to get over that because that is never going to happen. LOL
Truthfully, I don't even know why I keep it. I guess maybe now that a grandchild (and future grandchildren) are in my life, it's worth doing. Will they really give a rip about where I went though?
I think this might be a good winter project for me this year to keep myself occupied and in good spirits. It's hard not to smile and be happy when you are looking at mementos of good times.

I have some mementos, trinkets, special items, cards, letters, old photos, etc....that I want to keep. I have them in a decorative round hat box, rectangle hat box, and small trunk type storage, that I incorporate into my home decor.

I keep a nice two drawer file cabinet just for memorabilia. I keep a folder for each "event." Occasionally I will go through it and purge, if I've scrapped something and don't feel the need to keep something I will pitch the contents of that folder.

each person has there own tub/ then in the tub i have a binder with page proctors in them. They can put stuff in there or in photo boxes or just lose.
if they get full they person who owns it has to clean it up or out

I scrapbook it in pockets. Sometimes I use it as background for a page.  ( No, its not acid free)  After I finish scrapbook in an event or trip, if I don't use it, I throw it away. I keep it in a file with the pictures it belongs to until then.
Every scrapbook has a pocket page for the kids memorablia, art, letters, cards. If it's too big, I take a picture.

I used a national park brochure and a post card for these pages: 
I also use things like a piano recital or theater program  as background for a page. Almost all my pocket pages are made like this with vellum and stitching.

Each kid has a colour of binders. Items go in page protectors in the binders in chronological order.

Lots of times, all I need the brochures and tickets and such for is information. So once I've scrapped the event, the leftover things can go in the trash.

Over the years, I've done most of the things mentioned here for things I do want to use ... maps as background paper, pockets stitched onto pages, etc. Another thing I do sometimes, if I don't quite want to toss something but didn't want to scrap it either, is to slip it behind the finished page inside the page protector (between two pages).

I do have random boxes stuffed with paperwork and memorabilia that didn't get scrapped but I can't part with, either. I suppose I need to figure out something better to do with that stuff. =sigh=

Meanwhile, I have the same piles of memorabilia I haven't gotten to yet and sometimes I forget what I have when I'm scrapping. Need.a.better.system.

I use a variation of what Becky Higgins uses to organize her children's school items. I keep a 12x12 Iris container for each year. My intent was also to organize the items within each Iris container, but that never came to fruition, but at least I have the pictures and memorabilia organized by a year. That has worked for me. I was traveling for work and I organized my photos while at my hotel room each night, I could create the piles of stuff on the other bed in the hotel room. 

I'll try to locate the link to the video and add it.    ETA   link

 This is how I do it too. Memorabilia from Disney goes in the bin with all the other Disney stuff. Programs from a Christmas event would go in my Christmas bin. All of the assorted stuff for December Daily goes in there too, like the tag from the Christmas tree or the receipt from the Santa picture or tags off of DD's new St. Nicholas pjs, in a folder labeled with the year (because I'm a couple years behind!). Other travel memorabilia goes in the bin for that specific trip with those supplies. School papers, smaller artwork, etc. goes in the school bin. That way when I want to scrap some photos for any of these things, all of the stuff I would need to do it is all located together.

If it's something recent that I wish to scrap, I place it in a letter size manila envelope. I add the photos to the same envelope when I print them. I write the event and date on the envelope. I cross it off and re-use the envelope once I have completed the scrapbook page. I store the envelopes upright in magazine holders.

Older stuff from my kid's childhood is in one plastic bin per child. I hope to go through those eventually and purge, scan the artwork and print for scrapbooking, and decide what to keep.

I keep mine in photoboxes unless they are too large. Some years I have one box per year and other years I can put 2 ziploc bags in a box, each marked with its own year.

Larger items go into mailers with the year written on them and I store a bunch of those in a plastic sweater box in my closet.